BEYOND SP C25-4D-SD15.5-SP06 Indexable U-Drill Body | 15.5mm 4D CNC Deep Hole Drill
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BEYOND SP C25-4D-SD15.5-SP06
15.5mm 4D Heavy-Duty U-Drill | Precision Blind Hole Boring Specialist
High-Rigidity 15.5mm Deep Hole Boring Solution
The BEYOND SP C25-4D-SD15.5-SP06 is a professional-grade indexable insert drill engineered for extreme stability in deep hole boring. With a 15.5mm cutting diameter and a 4D depth ratio (62mm reach), this tool is the primary choice for blind hole machining. Featuring internal cooling and a precision-engineered spiral flute, it ensures rapid chip evacuation and superior surface finish on CNC lathes and machining centers.
Decoding the Model: SP C25-4D-SD15.5-SP06
Metric & Imperial Technical Specifications
| Feature | Metric (mm) | Imperial (Inch) |
|---|---|---|
| Drilling Diameter (SD) | 15.5 mm | 0.610" |
| Shank Diameter (C) | 25.0 mm | 0.984" |
| Max Drilling Depth (4D) | 62.0 mm | 2.441" |
| Equivalent Model | SP-C1.0-4D-SD0.610-SP06 | |
Premium 20CrMnTi Alloy & High-Efficiency Flute
Superior Tool Body Material: This indexable drill body is forged from premium 20CrMnTi alloy steel. The surface is treated with a vacuum-quenched hardening process (HRC 52-55), providing immense wear resistance and preventing tool deflection during large diameter drilling. The shock-resistant core is perfect for handling interrupted cuts in heavy-duty machining.
Optimized Spiral Flute (U-Groove): The specialized U-groove geometry features wide chip pockets designed for high-volume material removal. Combined with dual internal cooling holes, it allows high-pressure coolant to flush metal chips out of 62mm deep bores instantly, preventing chip packing and protecting the carbide inserts from thermal failure during blind hole machining.
Recommended Cutting Parameters (15.5mm 4D)
Suggested for Carbon Steel (HB < 250). Adjust based on machine rigidity:
- Cutting Speed (Vc): 100 - 160 m/min
- Feed Rate (f): 0.04 - 0.10 mm/rev
- Rotation Speed (N): Calculated as $$N = \frac{Vc \times 1000}{\pi \times 15.5}$$
- Coolant: High-pressure internal cooling (Thru-spindle) is mandatory for 4D depth.
Looking for a compatible side-lock holder for the 25mm shank?
SHOP COMPATIBLE C25 TOOL HOLDERSVerified Customer Reviews
"Solid Deep Hole Performance"
"I use the 15.5mm SP for blind hole bores in tough alloys. The core rigidity is much higher than other brands. Highly recommend BEYOND."
- Robert K. (USA)
"Chips Clear Instantly"
"Internal cooling is a lifesaver for 4D depth. Chips flush out smoothly with no packing. Arrived in Poland very quickly."
- Marek W. (Poland)
"Great value for B2B procurement. Fits SPMG06 perfectly and handles alloy steel without issue."
- Pedro S. (Brazil)
"The SP square inserts give a much flatter hole bottom for my manifold blocks than standard drills."
- Arthur L. (UK)
"Consistent and durable. 15.5mm is a precise size for our custom parts, and this tool body is reliable."
- Y. Watanabe (Japan)
SP Series Indexable Drill: Advantages & Considerations
- Uses 4-edge SPMG square inserts for lower cost-per-edge.
- Optimized for Blind Hole Machining (Flatter hole bottom).
- Reinforced tool body core for superior 4D depth rigidity.
- Requires slightly higher machine torque than WC drills.
- Mandatory high-pressure coolant for effective 62mm deep drilling.
Technical Q&A
Q: Why is SP better than WC for blind holes?
A: SP square inserts provide a flatter profile at the bottom of the bore. Additionally, the tool body is thicker and more rigid, which is essential for deep bores.
Q: Does this include the inserts?
A: No, this is for the tool body only. It is compatible with SPMG060204 carbide inserts.
Q: What is the benefit of the Side-Lock (C25) shank?
A: The 25mm straight shank allows for massive clamping force in side-lock holders, preventing tool rotation under high torque.
Machinist Tip: SP vs. WC U-Drills
SP Series (Square): The professional choice for Blind Hole (Blind Bores). Square inserts create a flatter bottom and offer maximum core strength for 4D deep hole boring.
WC Series (Trigon): Primarily used for Through Hole applications. WC inserts offer more cutting edges but the body core is thinner, making it less rigid than SP for extreme depths.
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.